Create README.md

Author: witold-swierzy

data-platform/core-converged-db/cross-model-database/README.md

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+Cross Model Database
+This area focuses on discussing different data models supported by Oracle Converged Database
+
+License
+Copyright (c) 2023 Oracle and/or its affiliates.
+
+Licensed under the Universal Permissive License (UPL), Version 1.0.
+
+See LICENSE for more details.